The 100 Most Powerful Women

#55 Ursula Burns

Burns, 49, heads the research, product development, manufacturing and marketing operations. Last year, launched a printer that produces pages as cheaply in color as in black and white. Also responsible for environmental operations; in 2007 Xerox was named a "Corporate Leader" by the U.S. Environmental Protection Agency. An engineer, started as a Xerox summer intern 28 years ago. Sits on numerous boards, including American Express, MIT and the University of Rochester. — Emily Stewart

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Published sources include Factiva, CIA factbook, State Department, country embassies, European Union website, U.S. Security and Exchange Commission filings, press releases, company websites and annual reports.